>>5011806it's just the way pongos are built
in the wild, they have to absorb all the nutrients they can from what little food they can find in the lean times, so it's only natural they got a bit pudgy with regular meals in captivity (plus not having to cover great distances in search of food doesn't help)
it's also why they're so slow compared to other apes, less movement equals less energy lost equals higher chance of surviving until you reach the next fruiting tree